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Long Q, Zhou W, Zhou H, Tang Y, Chen W, Liu Q, Bian X. Polyamine-containing natural products: structure, bioactivity, and biosynthesis. Nat Prod Rep 2024; 41:525-564. [PMID: 37873660 DOI: 10.1039/d2np00087c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Covering: 2005 to August, 2023Polyamine-containing natural products (NPs) have been isolated from a wide range of terrestrial and marine organisms and most of them exhibit remarkable and diverse activities, including antimicrobial, antiprotozoal, antiangiogenic, antitumor, antiviral, iron-chelating, anti-depressive, anti-inflammatory, insecticidal, antiobesity, and antioxidant properties. Their extraordinary activities and potential applications in human health and agriculture attract increasing numbers of studies on polyamine-containing NPs. In this review, we summarized the source, structure, classification, bioactivities and biosynthesis of polyamine-containing NPs, focusing on the biosynthetic mechanism of polyamine itself and representative polyamine alkaloids, polyamine-containing siderophores with catechol/hydroxamate/hydroxycarboxylate groups, nonribosomal peptide-(polyketide)-polyamine (NRP-(PK)-PA), and NRP-PK-long chain poly-fatty amine (lcPFAN) hybrid molecules.
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Affiliation(s)
- Qingshan Long
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China.
| | - Wen Zhou
- Key Laboratory of Veterinary Chemical Drugs and Pharmaceutics, Ministry of Agriculture and Rural, Affairs, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Haibo Zhou
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China.
| | - Ying Tang
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China.
| | - Wu Chen
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China.
| | - Qingshu Liu
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China.
| | - Xiaoying Bian
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China.
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2
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Du YF, Long Q, Wang JJ, Ma M, Mao JH. [Nutritional status of 15 children with progeria]. Zhonghua Er Ke Za Zhi 2024; 62:170-174. [PMID: 38264818 DOI: 10.3760/cma.j.cn112140-20230928-00230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
Objective: To analyze the nutritional status of progeria, and to provide reference for scientific nutritional management of progeria. Methods: This cross-sectional study included 15 children with progeria who were treated at Children's Hospital, Zhejiang University School of Medicine, between April 2022 and May 2023. Data of medical history, physical examination, laboratory tests, dietary survey and body composition were collected and analyzed. Results: Among 15 patients there were 7 males and 8 females, aged 7.8 (2.3, 10.8) years. Twelve of the 15 patients exhibited signs of malnutrition. A 24-hour dietary survey was carried out in 14 of them. The daily energy intake of 11 cases was below recommended levels. Carbohydrate intake was insufficient in 10 cases, protein intake was insufficient in 7 cases, and fat intake was insufficient in 12 cases. Deficiencies in calcium, magnesium, iron and zinc were noted in 13, 13, 9 and 10 cases, respectively. Body composition was determined by dual-energy X-ray absorptiometry in 8 cases, and the bone mineral density was below average in 5 of them. Conclusions: Malnutrition, characterized by reduced energy intake, micronutrient deficiencies, and alteration in body composition, is prevalent in children with progeria. Regular routine nutritional assessment and proper interventions may benefit their long-term health status.
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Affiliation(s)
- Y F Du
- Department of Clinical Nutrition, Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Q Long
- Department of Clinical Nutrition, Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J J Wang
- Department of Nephrology, Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - M Ma
- Department of Clinical Nutrition, Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J H Mao
- Department of Nephrology, Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
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Zhang Q, Zhao Y, Nie J, Long Q, Wang X, Wang X, Gong G, Liao L, Yi X, Chen BT. Pretreatment synthetic MRI features for triple-negative breast cancer. Clin Radiol 2024; 79:e219-e226. [PMID: 37935611 DOI: 10.1016/j.crad.2023.10.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 10/08/2023] [Accepted: 10/11/2023] [Indexed: 11/09/2023]
Abstract
AIM To evaluate the quantitative parameters derived from synthetic magnetic resonance imaging (SyMRI) for predicting triple-negative breast cancer (TNBC). MATERIALS AND METHODS This prospective study enrolled participants with invasive ductal breast carcinoma (IDBC) and separated them into a TNBC group and a Non-TNBC group. Preoperative breast MRI included both the SyMRI and conventional MRI sequences. The quantitative parameters derived from the SyMRI included T1 and T2 relaxation times, proton density (PD), and their standard deviations (SD). Clinicopathological characteristics, conventional MRI findings, and quantitative synthetic parameters were assessed for all participants. Multivariable logistic regression analysis was performed to determine the potential independent imaging predictors for TNBC preoperatively. Receiver operating characteristic (ROC) curve analysis was used to evaluate the performance of these parameters. RESULTS A total of 231 participants with histopathological proven IDBC were included in this study (n=46 in the TNBC group and n=185 in the Non-TNBC group). The TNBC group had significantly larger tumour size (p=0.011) and more frequent intratumoural cystic or necrotic lesions (p<0.001) as compared to the Non-TNBC group. The univariate analysis showed that the TNBC tumours had significantly higher T1 (p=0.006) and T2 (p<0.001) values than Non-TNBC tumours. Subsequent multivariable analysis indicated that T2 values and the presence of cystic or necrotic lesions were the independent predictors for TNBC. CONCLUSION The T2 from synthetic imaging and the presence of cystic degeneration or necrosis within the breast cancer may serve as potential imaging biomarkers for preoperative differentiation of TNBC from Non-TNBC.
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Affiliation(s)
- Q Zhang
- Department of Breast Surgery, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; Clinical Research Center for Breast Cancer, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Central South University, Changsha 410008, Hunan, PR China
| | - Y Zhao
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Central South University, Changsha 410008, Hunan, PR China; Department of Radiology, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China
| | - J Nie
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Central South University, Changsha 410008, Hunan, PR China; Department of Radiology, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China
| | - Q Long
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Central South University, Changsha 410008, Hunan, PR China; Department of Radiology, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China
| | - X Wang
- Department of Breast Surgery, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; Clinical Research Center for Breast Cancer, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Central South University, Changsha 410008, Hunan, PR China
| | - X Wang
- Department of Breast Surgery, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; Clinical Research Center for Breast Cancer, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Central South University, Changsha 410008, Hunan, PR China
| | - G Gong
- Department of Pathology, Xiangya School of Medicine, Central South University, Changsha 410008, Hunan, PR China
| | - L Liao
- Department of Breast Surgery, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; Clinical Research Center for Breast Cancer, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Central South University, Changsha 410008, Hunan, PR China.
| | - X Yi
- Department of Radiology, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology, Xiangya Hospital, Changsha 410008, Hunan, PR China; Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; Hunan Engineering Research Center of Skin Health and Disease, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China; Department of Dermatology, Xiangya Hospital, Central South University, Changsha 410008, Hunan, PR China.
| | - B T Chen
- Department of Diagnostic Radiology, City of Hope National Medical Center, Duarte, CA, USA
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Chang C, Bu Z, Long Q. CEDAR: communication efficient distributed analysis for regressions. Biometrics 2023; 79:2357-2369. [PMID: 36305019 PMCID: PMC10133408 DOI: 10.1111/biom.13786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 10/05/2022] [Indexed: 11/27/2022]
Abstract
Electronic health records (EHRs) offer great promises for advancing precision medicine and, at the same time, present significant analytical challenges. Particularly, it is often the case that patient-level data in EHRs cannot be shared across institutions (data sources) due to government regulations and/or institutional policies. As a result, there are growing interests about distributed learning over multiple EHRs databases without sharing patient-level data. To tackle such challenges, we propose a novel communication efficient method that aggregates the optimal estimates of external sites, by turning the problem into a missing data problem. In addition, we propose incorporating posterior samples of remote sites, which can provide partial information on the missing quantities and improve efficiency of parameter estimates while having the differential privacy property and thus reducing the risk of information leaking. The proposed approach, without sharing the raw patient level data, allows for proper statistical inference. We provide theoretical investigation for the asymptotic properties of the proposed method for statistical inference as well as differential privacy, and evaluate its performance in simulations and real data analyses in comparison with several recently developed methods.
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Affiliation(s)
- C. Chang
- University of Pennsylvania, PA 19104, USA
| | - Z. Bu
- University of Pennsylvania, PA 19104, USA
| | - Q. Long
- University of Pennsylvania, PA 19104, USA
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Lin L, Li X, Zhu S, Long Q, Hu Y, Zhang L, Liu Z, Li B, Li X. Ferroptosis-related NFE2L2 and NOX4 Genes are Potential Risk Prognostic Biomarkers and Correlated with Immunogenic Features in Glioma. Cell Biochem Biophys 2023; 81:7-17. [PMID: 36627482 PMCID: PMC9925512 DOI: 10.1007/s12013-022-01124-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 12/04/2022] [Indexed: 01/12/2023]
Abstract
Ferroptosis is a newfound mode of regulated cell death that may have potential to associate with prognostic or diagnostic factors in glioma. In this research, 5 genes related to glioma were screened through the FerrDb database, and we analyzed the combination between genes and glioma of survival and prognosis via TCGA, GEPIA, TIMER, and other databases. Survival curve and prognostic analysis showed that the overexpression of NFE2L2 and NOX4, respectively, has a remarkable link with a worse prognosis in glioma. Then, the association between the expression of the two genes and tumor-infiltrating immune cells level was explored based on the GSCA, and the immunity of NFE2L2 and NOX4 based on the TISIDB database was also investigated. In glioma, especially GBM, there is a strong association between gene expression and immune infiltration, even in macrophages, nTreg, and Th2 cells, which play immunosuppressive functions in TME. In conclusion, these results indicate that NFE2L2 and NOX4 could be risk prognosis biomarkers in glioma, and they bound up with immune infiltration and tumor immunity in tumorigenesis.
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Affiliation(s)
- Li Lin
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China
| | - Xiaona Li
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China ,grid.79703.3a0000 0004 1764 3838Department of Radiology, the Second Affiliated Hospital, School of Medicine, South China University of Technology, 516002 Guangdong, P.R. China
| | - Shunda Zhu
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China
| | - Qingshan Long
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China
| | - Yongzhen Hu
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China
| | - Liyang Zhang
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China
| | - Zexin Liu
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China
| | - Bo Li
- grid.410737.60000 0000 8653 1072Huizhou Third people’s hospital, Guangzhou medical university, Huizhou, 516002 Guangdong P.R. China
| | - Xuesong Li
- Huizhou Third people's hospital, Guangzhou medical university, Huizhou, 516002, Guangdong, P.R. China.
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Zhang Q, Hu WM, Deng YL, Long Q, Jin P. [The characteristics of gut microbiota in type 2 diabetes mellitus patients with hypertriglyceridemia]. Zhonghua Yi Xue Za Zhi 2022; 102:3763-3768. [PMID: 36517426 DOI: 10.3760/cma.j.cn112137-20220805-01700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Objective: To investigate the characteristics of gut microbiota in type 2 diabetes mellitus (T2DM) patients with hypertriglyceridemia (HTG). Methods: Eighty-one patients first diagnosed with T2DM were enrolled in the Third Xiangya Hospital of Central South University from January 2018 to December 2020, including 58 patients [46 males and 12 females, aged (43±13) years] with HTG [HTG group, triglyceride (TG)≥1.7 mmol/L]. There were 23 cases without HTG (NTG group), including 20 males and 3 females, aged (46±13) years. According to the severity of HTG, the patients of HTG group were divided into severe HTG group (STG group, TG ≥5.6 mmol/L) and mild HTG group (MTG group, 1.7 mmol/L≤TG<5.6 mmol/L). Thirty healthy controls were matched accordingly, including 21 males and 9 females, aged (45±6) years. Clinical laboratory indicators and feces of the subjects were collected and 16S rRNA sequencing was performed to compare the differences in intestinal flora among the groups. Results: The Shannon and Simpson indexes in HTG group were lower than those in NTG group and healthy control group (5.02±0.91 vs 5.45±0.55 and 5.60±0.63, P=0.003; 0.90±0.06 vs 0.93±0.04, 0.94±0.04, P=0.002). Compared with healthy control group and NTG group, the abundance of intestinal P_Proteobacteria, g_Escherichia_Shigella, s_Escherichia_Coli and g_Clostridium_sensu_stricto_1 increased in HTG group, while the abundance of p_Firmicutes, g_Faecalibacterium and Faecalibacterium_prausnitzii decreased. The abundance of g_Clostridium_sensu_stricto_1 in the STG group was higher than that of NTG and MTG groups, while the abundance of g_Faecalibacterium decreased. Spearman correlation analysis suggested that g_Clostridium_sensu_stricto_1 was positively correlated with glycosylated hemoglobin (r=0.22, P=0.044), fasting blood glucose (r=0.36, P=0.001), TG (r=0.27, P=0.015) and total cholesterol (r=0.44, P<0.001). Logistic regression analysis indicated that g_Faecalibacterium was a protective factor for T2DM with HTG(OR=0.90, 95%CI:0.83-0.97, P=0.006). Conclusions: The intestinal flora of T2DM patients with HTG was dysregulated, which was manifested as decreased diversity, increased abundance of P_Proteobacteria and decreased abundance of p_Firmicutes. g_Faecalibacterium is a protective factor for T2DM with HTG.
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Affiliation(s)
- Q Zhang
- Department of Endocrinology, the Third Xiangya Hospital of Central South University, Changsha 410007, China
| | - W M Hu
- Department of Endocrinology, the Third Xiangya Hospital of Central South University, Changsha 410007, China
| | - Y L Deng
- Health Management Center, Central South University, Changsha 410007, China
| | - Q Long
- Department of Endocrinology, the Third Xiangya Hospital of Central South University, Changsha 410007, China
| | - P Jin
- Department of Endocrinology, the Third Xiangya Hospital of Central South University, Changsha 410007, China
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Xia Y, Feng YJ, Yao M, Jin JN, Wei J, Cui YQ, Wang LS, Chen TT, Chen XY, Li HB, Xu JF, Long Q, Jiang Y, Liu JL, Lou JG, Gao F, Mao SS. [Clinical follow-up analysis of multidisciplinary treatment of children with spinal muscular atrophy]. Zhonghua Er Ke Za Zhi 2022; 60:1134-1139. [PMID: 36319146 DOI: 10.3760/cma.j.cn112140-20220221-00138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Objective: To analyze the follow-up and clinical effect of multidisciplinary treatment on the children with spinal muscular atrophy (SMA). Methods: The clinical data including nutritional status, respiratory function, bone health and motor function of 45 children with SMA who received multidisciplinary management 1-year follow-up in the Children's Hospital, Zhejiang University School of Medicine from July 2019 to October 2021 were retrospectively collected. Comparisons before and after management were performed using paired-samples t-test or Wilcoxon rank-sum test, etc. Results: The age of 45 patients (25 boys and 20 girls) was 50.4 (33.6, 84.0) months at the enrollment, with 6 cases of type 1, 22 cases of type 2, and 17 cases of type 3 respectively. After the multidisciplinary management, the cases of SMA patients with malnutrition decreased from 22 to 12 (P=0.030), the level of vitamin D were significantly increased ((45±17) vs. (48±14) nmol/L, t=-4.13, P<0.001). There was no significant difference in the forced vital capacity %pred, the forced expiratory volume at 1 second %pred, and the peak expiratory flow %pred ((76±19)% and (76±21)%, (81±18)% and (79±18)%, (81±21)% and (78±17)%; t=-0.24, 1.36, 1.21; all P>0.05). The Cobbs angle of scoliosis also improved significantly (8.0°(0°, 13.0°) vs. 10.0°(0°, 18.5°), Z=-3.01, P=0.003). The Hammersmith functional motor scale expanded scores of children with SMA type 2 and type 3 both showed significant elevation (11.0 (8.0, 18.0) vs. 11.0 (5.0, 18.5) scores, 44.0 (36.5, 53.0) vs. 44.0 (34.0, 51.5) scores, Z=2.44, 3.11, P=0.015, 0.002). Conclusion: Multidisciplinary management is beneficial for delaying the progression of the multi-system impairments of SMA patients, such as malnutrition, restrictive ventilation dysfunction and scoliosis.
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Affiliation(s)
- Y Xia
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Y J Feng
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - M Yao
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J N Jin
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J Wei
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Y Q Cui
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - L S Wang
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - T T Chen
- Department of Developmental Behavior, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - X Y Chen
- Department of Developmental Behavior, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - H B Li
- Department of Orthopedics, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J F Xu
- Department of Orthopedics, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Q Long
- Department of Clinial Nutrition, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Y Jiang
- Department of Respiratory, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J L Liu
- Department of Respiratory, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J G Lou
- Department of Gastroenterology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - F Gao
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - S S Mao
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
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Du J, Zhang C, Long Q, Zhang L, Chen W, Liu Q. Characterization of a pathway-specific activator of edeine biosynthesis and improved edeine production by its overexpression in Brevibacillus brevis. Front Plant Sci 2022; 13:1022476. [PMID: 36388555 PMCID: PMC9641203 DOI: 10.3389/fpls.2022.1022476] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Edeines are a group of non-ribosomal antibacterial peptides produced by Brevibacillus brevis. Due to the significant antibacterial properties of edeines, increasing edeine yield is of great interest in biomedical research. Herein, we identified that EdeB, a member of the ParB protein family, significantly improved edeine production in B. brevis. First, overexpression of edeB in B. brevis X23 increased edeine production by 92.27%. Second, in vitro bacteriostasis experiment showed that edeB-deletion mutant exhibited less antibacterial activity. Third, RT-qPCR assay demonstrated that the expression of edeA, edeQ, and edeK, which are key components of the edeine biosynthesis pathway, in edeB-deletion mutant X23(ΔedeB) was significantly lower than that in wild-type B. brevis strain X23. Finally, electrophoretic mobility shift assay (EMSA) showed that EdeB directly bound to the promoter region of the edeine biosynthetic gene cluster (ede BGC), suggesting that EdeB improves edeine production through interaction with ede BGC in B. brevis.
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Affiliation(s)
- Jie Du
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, China
| | - Cuiyang Zhang
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, China
| | - Qingshan Long
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, China
| | - Liang Zhang
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Wu Chen
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Qingshu Liu
- Hunan Provincial Engineering and Technology Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, China
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Mao SS, Feng YJ, Xu L, Yao M, Xia Y, Jin JN, Wang LS, Chen TT, Chen XY, Zhang Y, Zhang H, Jiang Y, Li HB, Long Q, Gao F. [Clinical follow-up analysis of nusinersen in the disease-modifying treatment of pediatric spinal muscular atrophy]. Zhonghua Er Ke Za Zhi 2022; 60:688-693. [PMID: 35768357 DOI: 10.3760/cma.j.cn112140-20211223-01075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: To explore the clinical efficacy of disease-modifying drug nusinersen on children with spinal muscular atrophy. Methods: The baseline and longitudinal clinical data of 15 children who were treated with nusinersen in the Children's Hospital, Zhejiang University School of Medicine from October 2019 to October 2021 were retrospectively collected. The general data (gender, age, genotype, and clinical classification, etc.), motor function, nutritional status, scoliosis and respiratory function were analyzed. Wilcoxon rank-sum test was used for comparing multi-system conditions before and after treatment. Results: The age of 15 cases (7 males, 8 females) was 6.8 (2.8, 8.3) years, with 2 cases of type 1, 6 cases of type 2, and 7 cases of type 3 respectively, and the course of disease was 55.0 (21.0, 69.0) months. After 9.0 (9.0, 24.0) months of treatment, the motor function scale evaluations of the Hammersmith neurological examination section 2 (13.0 (7.0, 23.0) vs. 18.0 (10.0, 25.0) scores, Z=-2.67, P=0.018) of 15 children, the Hammersmith functional motor scale expanded (38.0 (18.5, 45.5) vs. 42.0 (23.0, 51.0) scores, Z=-2.38, P=0.018), and the revised upper limb module (27.0 (19.5, 32.0) vs. 33.0 (22.5, 35.5) scores, Z=-2.52, P=0.012) of children with type 2 and 3 had significantly improved. Thirteen patients achieved clinically significant motor function improvement, and 2 of them had kept stable scale scores. Subjective reports also indicated that the muscle strength and daily exercise ability of these children improved after treatment, and no serious adverse reactions were reported. Supplemented by the multi-disciplinary team management, the levels of some indicators such as Cobbs angle of scoliosis and forced vital capacity all had significantly improved (all P<0.05). Conclusions: Nusinersen can improve the motor function of patients with 5q spinal muscular atrophy, which is also proved safe to be used in children. The drug treatment supplemented by the multi-disciplinary team management is helpful to improve the multi-system function of the children with spinal muscular atrophy.
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Affiliation(s)
- S S Mao
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Y J Feng
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - L Xu
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - M Yao
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Y Xia
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - J N Jin
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - L S Wang
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - T T Chen
- Department of Developmental Behavior, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - X Y Chen
- Department of Developmental Behavior, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Y Zhang
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - H Zhang
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Y Jiang
- Department of Pulmonary, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - H B Li
- Department of Orthopedics, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - Q Long
- Department of Clinical Nutrition, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
| | - F Gao
- Department of Neurology, the Children's Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou 310052, China
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10
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Zhao M, Liu X, Yuan C, Zheng W, Zhang D, Long Q, Li J, Han T, Xu L, Li H, Li X, Shi S. 16P Camrelizumab monotherapy or plus apatinib for PD-L1-positive advanced pulmonary sarcomatoid carcinoma: A single-arm, open-label, multicenter, phase II study. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.02.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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11
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Teng Z, Zhu Y, Teng Y, Long Q, Hao Q, Yu X, Yang L, Lv Y, Liu J, Zeng Y, Lu S. The analysis of osteosarcopenia as a risk factor for fractures, mortality, and falls. Osteoporos Int 2021; 32:2173-2183. [PMID: 33877382 DOI: 10.1007/s00198-021-05963-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 04/14/2021] [Indexed: 12/14/2022]
Abstract
UNLABELLED Osteosarcopenia is defined as the concomitant occurrence of sarcopenia and osteoporosis/osteopenia. This study aimed to clarify whether osteosarcopenia implies a greater risk of fractures, mortality, and falls and to draw attention to osteosarcopenia. INTRODUCTION Osteosarcopenia, which is characterized by the co-existence of osteoporosis/osteopenia and sarcopenia, is one of the most challenging geriatric syndromes. However, the association between osteosarcopenia and the risk of falls, fractures, disability, and mortality is controversial. METHODS We searched PubMed, Embase, and the Cochrane Central Register of Controlled Trials, from their inception to March 18, 2021, for cohort studies on the relationship between osteosarcopenia and fractures, falls, and mortality. Two reviewers independently extracted data and assessed study quality. A pooled analysis was performed to calculate odds ratios (ORs) and 95% confidence intervals (CIs) using fixed or random-effects models. RESULTS Eight cohort studies including 19,836 participants showed that osteosarcopenia significantly increased the risk of fracture (OR 2.46, 95% CI 1.83-3.30, Pheterogeneity = 0.006, I2 = 63.0%), three cohort studies involving 2601 participants indicated that osteosarcopenia significantly increased the risk of mortality (OR 1.66, 95% CI 1.23-2.26, Pheterogeneity = 0.214, I2 = 35.2%), and three cohort studies involving 3144 participants indicated that osteosarcopenia significantly increased the risk of falls (OR 1.62, 95% CI 1.28-2.04, Pheterogeneity = 0.219, I2 = 34.1%). No publication bias existed among the studies regarding the association between osteosarcopenia and fractures. The findings were robust according to the subgroup and sensitivity analyses. CONCLUSIONS This pooled analysis demonstrated that osteosarcopenia significantly increased the risk of fractures, falls, and mortality, thus highlighting its relevance in daily life. Therefore, we suggest that elderly persons should be aware of the risks associated with osteosarcopenia.
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Affiliation(s)
- Z Teng
- The Sixth Affiliated Hospital of Kunming Medical University, Kunming, Yuxi, China
- Yunnan Key Laboratory of Digital Orthopedics, The First People's Hospital of Yunnan Province, Kunming, China
- Graduate School of Kunming Medical University, Kunming, China
| | - Y Zhu
- The Sixth Affiliated Hospital of Kunming Medical University, Kunming, Yuxi, China
| | - Y Teng
- The Sixth Affiliated Hospital of Kunming Medical University, Kunming, Yuxi, China
| | - Q Long
- The Sixth Affiliated Hospital of Kunming Medical University, Kunming, Yuxi, China
| | - Q Hao
- The Sixth Affiliated Hospital of Kunming Medical University, Kunming, Yuxi, China
| | - X Yu
- Graduate School of Kunming Medical University, Kunming, China
| | - L Yang
- Graduate School of Kunming Medical University, Kunming, China
| | - Y Lv
- The Sixth Affiliated Hospital of Kunming Medical University, Kunming, Yuxi, China
| | - J Liu
- Graduate School of Kunming Medical University, Kunming, China
| | - Y Zeng
- The Sixth Affiliated Hospital of Kunming Medical University, Kunming, Yuxi, China.
| | - S Lu
- Yunnan Key Laboratory of Digital Orthopedics, The First People's Hospital of Yunnan Province, Kunming, China.
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12
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Liu Q, Zhang L, Wang Y, Zhang C, Liu T, Duan C, Bian X, Guo Z, Long Q, Tang Y, Du J, Liu A, Dai L, Li D, Chen W. Enhancement of edeine production in Brevibacillus brevis X23 via in situ promoter engineering. Microb Biotechnol 2021; 15:577-589. [PMID: 34310825 PMCID: PMC8867987 DOI: 10.1111/1751-7915.13825] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 04/22/2021] [Accepted: 04/26/2021] [Indexed: 11/28/2022] Open
Abstract
Edeines, a group of cationic antimicrobial peptides produced by the soil bacterium Brevibacillus, have broad biological effects, such as antimicrobial, anticancer and immunosuppressive activities. However, the yield of edeines in wild-type (WT) Brevibacillus is extremely low, and chemical synthesis of edeines is a time-consuming process. Genetic engineering has proven to be an effective approach to produce antibiotics with high yield. In this study, the edeine biosynthetic gene cluster (ede BGC), which is involved in edeine production, was identified and characterized in Brevibacillus brevis X23. To improve edeine production in B. brevis X23, the ede BGC promoter was replaced with six different promoters, Pmwp , Pspc , PxylA , Pshuttle-09 , Pgrac or P43 , through double-crossover homologous recombination. The new promoters significantly increased the expression of the ede BGC as well as edeine production by 2.9 ± 0.4 to 20.5 ± 1.2-fold and 3.6 ± 0.1to 8.7 ± 0.7-fold respectively. The highest yield of edeines (83.6 mg l-1 ) was obtained in B. brevis X23 with the Pmwp promoter. This study provides a practical approach for producing high yields of edeines in B. brevis.
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Affiliation(s)
- Qingshu Liu
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China.,Hunan Province Engineering Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China
| | - Liang Zhang
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China.,College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
| | - Yunsheng Wang
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China
| | - Cuiyang Zhang
- Hunan Province Engineering Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China
| | - Tianbo Liu
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China
| | - Caichen Duan
- Hunan Province Engineering Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China
| | - Xiaoying Bian
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, China
| | - Zhaohui Guo
- Hunan Province Engineering Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China
| | - Qingshan Long
- Hunan Province Engineering Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China
| | - Ying Tang
- Hunan Province Engineering Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China
| | - Jie Du
- Hunan Province Engineering Research Center for Agricultural Microbiology Application, Hunan Institute of Microbiology, Changsha, 410009, China
| | - Aiyu Liu
- College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
| | - Liangying Dai
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China
| | - Dingjun Li
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China.,Hunan University of Technology and Business, Changsha, 410205, China
| | - Wu Chen
- College of Plant Protection, Hunan Agricultural University, Changsha, 410128, China
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13
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Long Q, Wu B, Yang Y, Wang S, Shen Y, Bao Q, Xu F. Nerve guidance conduit promoted peripheral nerve regeneration in rats. Artif Organs 2021; 45:616-624. [PMID: 33270261 DOI: 10.1111/aor.13881] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 11/19/2020] [Accepted: 11/27/2020] [Indexed: 12/13/2022]
Abstract
Nerve growth factor (NGF) is important for peripheral nerve regeneration. However, its short half-life and rapid diffusion in body fluids limit its clinical efficacy. Collagen has favorable biocompatibility and biodegradability, and weak immunogenicity. Because it possesses an NGF binding domain, we cross-linked heparin to collagen tubes to construct nerve guidance conduits for delivering NGF. The conduits were implanted to bridge a facial nerve defect in rats. Histological and functional analyses were performed to assess the effect of the nerve guidance conduit on facial nerve regeneration. Heparin enhanced the binding of NGF to collagen while retaining its bioactivity. Also, the nerve guidance conduit significantly promoted axonal growth and Schwan cell proliferation at 12 weeks after surgery. The nerve regeneration and functional recovery outcomes using the nerve guidance conduit were similar to those of autologous nerve grafting. Therefore, the nerve guidance conduit may promote safer nerve regeneration.
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Affiliation(s)
- Qingshan Long
- Department of Neurosurgery, Huizhou Third People's Hospital, Guangzhou Medical University, Huizhou, China
| | - Bingshan Wu
- Department of Neurosurgery, First Affiliated Hospital of Anhui Medical University, Hefei City, China
| | - Yu Yang
- Department of Psychiatry, Zigong Mental Health Center, Zigong City, China
| | - Shanhong Wang
- Department of Psychiatry, Zigong Mental Health Center, Zigong City, China
| | - Yiwen Shen
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
| | - Qinghua Bao
- Department of Neurosurgery, Affiliated Aoyang Hospital of Jiangsu University, Zhangjiagang, China
| | - Feng Xu
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
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14
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Zeng W, Zhang C, Long Q, Li Y. Dexmedetomidine Alleviates LPS-Induced Neuronal Dysfunction by Modulating the AKT/GSK-3β/CRMP-2 Pathway in Hippocampal Neurons. Neuropsychiatr Dis Treat 2021; 17:671-680. [PMID: 33727816 PMCID: PMC7955869 DOI: 10.2147/ndt.s297365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 02/05/2021] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE Dexmedetomidine, an α2-adrenergic receptor agonist, mitigates cognitive dysfunction in elderly patients after surgery with general anesthesia. However, the underlying mechanism by which dexmedetomidine reduces cognitive dysfunction remains to be fully elucidated. The aim of this study was to investigate the effects of dexmedetomidine on lipopolysaccharide (LPS)-induced neuronal dysfunction in cultured hippocampal neurons. METHODS LPS, in the presence and absence of dexmedetomidine, was applied to cultured hippocampal neurons to mimic post-surgical inflammation. Neuronal morphology, including neurite outgrowth and synaptic transmission, was observed, and miniature excitatory postsynaptic currents were recorded by electrophysiological patch-clamp. RESULTS LPS significantly impaired neurite outgrowth in hippocampal neurons in a concentration- and time-dependent manner, which was reversed by dexmedetomidine treatment. Electrophysiological patch-clamp results showed that LPS induced synaptic transmission dysfunction, which was restored after dexmedetomidine addition. Furthermore, Western blotting assays showed that LPS suppressed the AKT/GSK-3β/CRMP-2 signaling pathway and dexmedetomidine countered the inhibitory effect of LPS by re-activating this pathway. CONCLUSION In general, dexmedetomidine protected against the effects of LPS-induced hippocampal neuron damage, including neurite outgrowth and synaptic transmission. Overall, dexmedetomidine modulated the AKT/GSK-3β/CRMP-2 signaling pathway to alleviate LPS-induced neurological dysfunction.
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Affiliation(s)
- Wei Zeng
- Department of Anesthesiology, The First Affiliated Hospital of Jinan University, Guangzhou, 510630, Guangdong, People's Republic of China.,Department of Anesthesiology, Affiliated Boai Hospital of Zhongshan, Southern Medical University, Zhongshan, 528400, Guangdong, People's Republic of China
| | - Chunyuan Zhang
- Department of Anesthesiology, Affiliated Boai Hospital of Zhongshan, Southern Medical University, Zhongshan, 528400, Guangdong, People's Republic of China
| | - Qingshan Long
- Department of Neurosurgery, Huizhou Third People's Hospital, Guangzhou Medical University, Huizhou, 516002, Guangdong, People's Republic of China
| | - Yalan Li
- Department of Anesthesiology, The First Affiliated Hospital of Jinan University, Guangzhou, 510630, Guangdong, People's Republic of China
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15
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Lü J, Long Q, Zhao Z, Chen L, He W, Hong J, Liu K, Wang Y, Pang X, Deng Z, Tao M. Engineering the Erythromycin-Producing Strain Saccharopolyspora erythraea HOE107 for the Heterologous Production of Polyketide Antibiotics. Front Microbiol 2020; 11:593217. [PMID: 33363524 PMCID: PMC7752772 DOI: 10.3389/fmicb.2020.593217] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 11/10/2020] [Indexed: 11/17/2022] Open
Abstract
Bacteria of the genus Saccharopolyspora produce important polyketide antibiotics, including erythromycin A (Sac. erythraea) and spinosad (Sac. spinosa). We herein report the development of an industrial erythromycin-producing strain, Sac. erythraea HOE107, into a host for the heterologous expression of polyketide biosynthetic gene clusters (BGCs) from other Saccharopolyspora species and related actinomycetes. To facilitate the integration of natural product BGCs and auxiliary genes beneficial for the production of natural products, the erythromycin polyketide synthase (ery) genes were replaced with two bacterial attB genomic integration sites associated with bacteriophages ϕC31 and ϕBT1. We also established a highly efficient conjugation protocol for the introduction of large bacterial artificial chromosome (BAC) clones into Sac. erythraea strains. Based on this optimized protocol, an arrayed BAC library was effectively transferred into Sac. erythraea. The large spinosad gene cluster from Sac. spinosa and the actinorhodin gene cluster from Streptomyces coelicolor were successfully expressed in the ery deletion mutant. Deletion of the endogenous giant polyketide synthase genes pkeA1-pkeA4, the product of which is not known, and the flaviolin gene cluster (rpp) from the bacterium increased the heterologous production of spinosad and actinorhodin. Furthermore, integration of pJTU6728 carrying additional beneficial genes dramatically improved the yield of actinorhodin in the engineered Sac. erythraea strains. Our study demonstrated that the engineered Sac. erythraea strains SLQ185, LJ161, and LJ162 are good hosts for the expression of heterologous antibiotics and should aid in expression-based genome-mining approaches for the discovery of new and cryptic antibiotics from Streptomyces and rare actinomycetes.
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Affiliation(s)
- Jin Lü
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Qingshan Long
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Zhilong Zhao
- State Key Laboratory of Microbial Technology, School of Life Sciences, Shandong University, Jinan, China
| | - Lu Chen
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Weijun He
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Jiali Hong
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Kai Liu
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Yemin Wang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Xiuhua Pang
- State Key Laboratory of Microbial Technology, School of Life Sciences, Shandong University, Jinan, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Meifeng Tao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, Shanghai-Islamabad-Belgrade Joint Innovation Center on Antibacterial Resistances, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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16
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Zhang CX, Zhang ZQ, Xu KF, Long Q, Yang ZK, Dai RP, Du H, Li DH. [The fundus autofluorescence of retinal astrocytic hamartomas in tuberous sclerosis complex]. Zhonghua Yan Ke Za Zhi 2020; 56:211-216. [PMID: 32187950 DOI: 10.3760/cma.j.issn.0412-4081.2020.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the autofluorescence findings of retinal astrocytic hamartoma (RAH) in patients with tuberous sclerosis complex (TSC). Methods: It was a retrospective case series study. Twenty-three patients (35 eyes) who were referred to Department of Internal Medicine and Department of Ophthalmology, Peking Union Medical College Hospital between November 2012 and June 2018 with established TSC-associated RAH diagnosis were included. The findings of fundus autofluorescence, fundus photos and spectral-domain optical coherence tomography (SD-OCT) were retrospectively reviewed. RAH lesions were classified into three types based on the morphology shown in fundus photos. The fundus autofluorescence features of TSC-associated RAH were described. The Welch's test and Fisher's exact test were used for statistical analysis. Results: The patients were 8 males and 15 females aged (28±9) years old (range, 15-55 years). Seventy-two RAH lesions were examined, including 59 type 1 RAHs, 7 type 2 RAHs and 6 type 3 RAHs. According to fundus autofluorescence, type 1 RAHs could be further divided into reduced, speckled and background autofluorescence patterns, among which the hypoautofluorescence pattern accounted for the majority (69.5%, 41/59), while the speckled pattern was usually accompanied by outer retinal disorganization and discontinuation of photoreceptor outer segment as revealed by SD-OCT. No significant difference was revealed in tumor thickness for reduced, speckled and background autofluorescence patterns of type 1 RAHs [(490.2±97.9) vs. (589.2±221.6) vs. (463.0±76.2) μm respectively, F=1.426, P=0.283]. Among type 1 RAHs, the number of reduced autofluorescence pattern lesions found in perifoveal, peripapillary, inferonasal, inferotemporal, superonasal, superotemporal quadrants were 9, 4, 4, 7, 4, 13 respectively, while that of speckled autofluorescence pattern lesions were 3, 0, 3, 2, 3, 2 and background autoflurorescence pattern lesions 3, 0, 1, 1, 0, 0. No significant difference was revealed in location distribution (P=0.452) either. Type 2 RAHs featured numerous hyperautofluorescent spots or plaques, and calcification in type 2 RAHs varied in autofluorescence intensity. Type 3 RAHs, combining the features of type 1 and 2 RAHs, were characterized by central hyperautofluorescent spots and hypoautoflurescent rim, but the area of hyperautofluorescence was smaller than that of calcification as shown in fundus photos. Conclusions: In TSC, the fundus autofluorescence of RAHs varies from hypoautofluorescence to hyperautofluorescence patterns according to RAH types. The retinal involvement and calcification degree of TSC-associated RAHs could be reflected on the autofluorescence, which was beneficial to the full assessment. (Chin J Ophthalmol, 2020, 56: 211-216).
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Affiliation(s)
- C X Zhang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Key Laboratory of Ocular Fundus Diseases, Beijing 100730, China
| | - Z Q Zhang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Key Laboratory of Ocular Fundus Diseases, Beijing 100730, China
| | - K F Xu
- Department of Pulmonary and Critical Care Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Rare Diseases Research Center, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - Q Long
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Key Laboratory of Ocular Fundus Diseases, Beijing 100730, China
| | - Z K Yang
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Key Laboratory of Ocular Fundus Diseases, Beijing 100730, China
| | - R P Dai
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Key Laboratory of Ocular Fundus Diseases, Beijing 100730, China
| | - H Du
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Key Laboratory of Ocular Fundus Diseases, Beijing 100730, China
| | - D H Li
- Department of Ophthalmology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Key Laboratory of Ocular Fundus Diseases, Beijing 100730, China
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17
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Staimez LR, Rhee MK, Deng Y, Safo SE, Butler SM, Legvold BT, Jackson SL, Ford CN, Wilson PWF, Long Q, Phillips LS. Retinopathy develops at similar glucose levels but higher HbA 1c levels in people with black African ancestry compared to white European ancestry: evidence for the need to individualize HbA 1c interpretation. Diabet Med 2020; 37:1049-1057. [PMID: 32125000 DOI: 10.1111/dme.14289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/26/2020] [Indexed: 11/29/2022]
Abstract
AIMS To examine the association of HbA1c and glucose levels with incident diabetic retinopathy according to black African or white European ancestry. METHODS In this retrospective cohort study of 202 500 US Veterans with diabetes (2000-2014), measures included HbA1c , outpatient random serum/plasma glucose, and incident retinopathy [conversion from negative to ≥2 positive evaluations (ICD-9 codes), without a subsequent negative]. RESULTS At baseline, the study population had a mean age of 59.3 years, their mean BMI was 31.9 kg/m2 , HbA1c level was 57 mmol/mol (7.4%) and glucose level was 8.8 mmol/l, and 77% were of white European ancestry (white individuals) and 21% of black African ancestry (black individuals). HbA1c was 0.3% higher in black vs white individuals (P < 0.001), adjusting for baseline age, sex, BMI, estimated glomerular filtration rate (eGFR), haemoglobin, and average systolic blood pressure and glucose. Over 11 years, incident retinopathy occurred in 9% of black and 7% of white individuals, but black individuals had higher HbA1c , glucose, and systolic blood pressure (all P < 0.001); adjusted for these factors, incident retinopathy was reduced in black vs white individuals (P < 0.001). The population incidence of retinopathy (7%) was associated with higher mean baseline HbA1c in individuals with black vs white ancestry [63 mmol/mol (7.9%) vs 58 mmol/mol (7.5%); P < 0.001)], but with similar baseline glucose levels (9.0 vs 9.0 mmol/l; P = 0.660, all adjusted for baseline age, sex and BMI). CONCLUSIONS Since retinopathy occurs at higher HbA1c levels in black people for a given level of average plasma glucose, strategies may be needed to individualize the interpretation of HbA1c measurements.
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Affiliation(s)
- L R Staimez
- Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - M K Rhee
- Atlanta Veterans Affairs Medical Centre, Decatur, GA, USA
- Division of Endocrinology and Metabolism, Department of Medicine, School of Medicine, Emory University, Atlanta, GA, USA
| | - Y Deng
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - S E Safo
- Division of Biostatistics, University of Minnesota, Minneapolis, MN, USA
| | - S M Butler
- Department of Medicine, School of Medicine, Emory University, Atlanta, GA, USA
| | - B T Legvold
- Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - S L Jackson
- Division for Heart Disease and Stroke Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - C N Ford
- Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - P W F Wilson
- Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
- Atlanta Veterans Affairs Medical Centre, Decatur, GA, USA
- Cardiology Division, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Q Long
- Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania, Philadelphia, PA, USA
| | - L S Phillips
- Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
- Atlanta Veterans Affairs Medical Centre, Decatur, GA, USA
- Division of Endocrinology and Metabolism, Department of Medicine, School of Medicine, Emory University, Atlanta, GA, USA
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Grewal A, Min E, Long Q, Jain V, Levin W, Cengel K, Swisher-McClure S, Aggarwal C, Bauml J, Singh A, Ciunci C, Cohen R, Langer C, Feigenberg S, Berman A. Early Tumor and Nodal Response in Patients with Locally-advanced NSCLC Predicts for Oncologic Outcomes in Patients Treated with Concurrent Chemotherapy and Proton Therapy. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Peng Q, Gao G, Lü J, Long Q, Chen X, Zhang F, Xu M, Liu K, Wang Y, Deng Z, Li Z, Tao M. Engineered Streptomyces lividans Strains for Optimal Identification and Expression of Cryptic Biosynthetic Gene Clusters. Front Microbiol 2018; 9:3042. [PMID: 30619133 PMCID: PMC6295570 DOI: 10.3389/fmicb.2018.03042] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Accepted: 11/26/2018] [Indexed: 11/24/2022] Open
Abstract
Streptomyces lividans is a suitable host for the heterologous expression of biosynthetic gene clusters (BGCs) from actinomycetes to discover “cryptic” secondary metabolites. To improve the heterologous expression of BGCs, herein we optimized S. lividans strain SBT5 via the stepwise integration of three global regulatory genes and two codon-optimized multi-drug efflux pump genes and deletion of a negative regulatory gene, yielding four engineered strains. All optimization steps were observed to promote the heterologous production of polyketides, non-ribosomal peptides, and hybrid antibiotics. The production increments of these optimization steps were additional, so that the antibiotic yields were several times or even dozens of times higher than the parent strain SBT5 when the final optimized strain, S. lividans LJ1018, was used as the heterologous expression host. The heterologous production of these antibiotics in S. lividans LJ1018 and GX28 was also much higher than in the strains from which the BGCs were isolated. S. lividans LJ1018 and GX28 markedly promoted the heterologous production of secondary metabolites, without requiring manipulation of gene expression components such as promoters on individual gene clusters. Therefore, these strains are well-suited as heterologous expression hosts for secondary metabolic BGCs. In addition, we successfully conducted high-throughput library expression and functional screening (LEXAS) of one bacterial artificial chromosome library and two cosmid libraries of three Streptomyces genomes using S. lividans GX28 as the library-expression host. The LEXAS experiments identified clones carrying intact BGCs sufficient for the heterologous production of piericidin A1, murayaquinone, actinomycin D, and dehydrorabelomycin. Notably, due to lower antibiotic production, the piericidin A1 BGC had been overlooked in a previous LEXAS screening using S. lividans SBT5 as the expression host. These results demonstrate the feasibility and superiority of S. lividans GX28 as a host for high-throughput screening of genomic libraries to mine cryptic BGCs and bioactive compounds.
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Affiliation(s)
- Qinying Peng
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Guixi Gao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Jin Lü
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Qingshan Long
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Xuefei Chen
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Fei Zhang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Min Xu
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Kai Liu
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Yemin Wang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Zhiyong Li
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Meifeng Tao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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Zhu YQ, Long Q, Xiao QF, Zhang M, Wei YL, Jiang H, Tang B. [The association between blood pressure variability and sleep stability in essential hypertensive patients with sleep disorder]. Zhonghua Yi Xue Za Zhi 2018; 98:755-758. [PMID: 29562400 DOI: 10.3760/cma.j.issn.0376-2491.2018.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the association of blood pressure variability and sleep stability in essential hypertensive patients with sleep disorder by cardiopulmonary coupling. Methods: Performed according to strict inclusion and exclusion criteria, 88 new cases of essential hypertension who came from the international department and the cardiology department of china-japan friendship hospital were enrolled. Sleep stability and 24 h ambulatory blood pressure data were collected by the portable sleep monitor based on cardiopulmonary coupling technique and 24 h ambulatory blood pressure monitor. Analysis the correlation of blood pressure variability and sleep stability. Results: In the nighttime, systolic blood pressure standard deviation, systolic blood pressure variation coefficient, the ratio of the systolic blood pressure minimum to the maximum, diastolic blood pressure standard deviation, diastolic blood pressure variation coefficient were positively correlated with unstable sleep duration (r=0.185, 0.24, 0.237, 0.43, 0.276, P<0.05). Conclusions: Blood pressure variability is associated with sleep stability, especially at night, the longer the unstable sleep duration, the greater the variability in night blood pressure.
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Affiliation(s)
- Y Q Zhu
- Internation Department China-Japan Friendship Hospital, Beijing 100029, China
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21
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Mittal T, Reichmuth L, Jain M, Baltabaeva A, Rahman Haley S, Kabir T, Dalby M, Long Q. 2182Discrepancy of cardiac computed tomography anatomical aortic valve area with echocardiographic haemodynamic parameters and evaluation of potential mechanisms using computational flow dynamics. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.2182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Gao G, Liu X, Xu M, Wang Y, Zhang F, Xu L, Lv J, Long Q, Kang Q, Ou HY, Wang Y, Rohr J, Deng Z, Jiang M, Lin S, Tao M. Formation of an Angular Aromatic Polyketide from a Linear Anthrene Precursor via Oxidative Rearrangement. Cell Chem Biol 2017; 24:881-891.e4. [PMID: 28712746 DOI: 10.1016/j.chembiol.2017.06.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/28/2017] [Accepted: 06/16/2017] [Indexed: 12/24/2022]
Abstract
Bacterial aromatic polyketides are a group of natural products synthesized by polyketide synthases (PKSs) that show diverse structures and biological activities. They are structurally subclassified into linear, angular, and discoid aromatic polyketides, the formation of which is commonly determined by the shaping and folding of the poly-β-keto intermediates under the concerted actions of the minimal PKSs, cyclases and ketoreductases. Murayaquinone, found in several streptomycetes, possesses an unusual tricyclic angular aromatic polyketide core containing a 9,10-phenanthraquinone. In this study, genes essential for murayaquinone biosynthesis were identified, and a linear anthraoxirene intermediate was discovered. A unique biosynthetic model for the angular aromatic polyketide formation was discovered and confirmed through in vivo and in vitro studies. Three oxidoreductases, MrqO3, MrqO6, and MrqO7, were identified to catalyze the conversion of the linear aromatic polyketide intermediate into the final angularly arranged framework, which exemplifies a novel strategy for the biosynthesis of angular aromatic polyketides.
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Affiliation(s)
- Guixi Gao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Xiangyang Liu
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Min Xu
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Yemin Wang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Fei Zhang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Lijun Xu
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Jin Lv
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Qingshan Long
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Qianjin Kang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Hong-Yu Ou
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Ying Wang
- Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, JNU-HKUST Joint Laboratory for Neuroscience and Innovative Drug Research, Jinan University, Guangzhou 510632, P. R. China
| | - Jürgen Rohr
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536, USA
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
| | - Ming Jiang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
| | - Shuangjun Lin
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
| | - Meifeng Tao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, P. R. China.
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Jackson SL, Safo SE, Staimez LR, Olson DE, Narayan KMV, Long Q, Lipscomb J, Rhee MK, Wilson PWF, Tomolo AM, Phillips LS. Glucose challenge test screening for prediabetes and early diabetes. Diabet Med 2017; 34:716-724. [PMID: 27727467 PMCID: PMC5388592 DOI: 10.1111/dme.13270] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 08/15/2016] [Accepted: 10/06/2016] [Indexed: 12/29/2022]
Abstract
AIMS To test the hypothesis that a 50-g oral glucose challenge test with 1-h glucose measurement would have superior performance compared with other opportunistic screening methods. METHODS In this prospective study in a Veterans Health Administration primary care clinic, the following test performances, measured by area under receiver-operating characteristic curves, were compared: 50-g oral glucose challenge test; random glucose; and HbA1c level, using a 75-g oral glucose tolerance test as the 'gold standard'. RESULTS The study population was comprised of 1535 people (mean age 56 years, BMI 30.3 kg/m2 , 94% men, 74% black). By oral glucose tolerance test criteria, diabetes was present in 10% and high-risk prediabetes was present in 22% of participants. The plasma glucose challenge test provided area under receiver-operating characteristic curves of 0.85 (95% CI 0.78-0.91) to detect diabetes and 0.76 (95% CI 0.72-0.80) to detect high-risk dysglycaemia (diabetes or high-risk prediabetes), while area under receiver-operating characteristic curves for the capillary glucose challenge test were 0.82 (95% CI 0.75-0.89) and 0.73 (95% CI 0.69-0.77) for diabetes and high-risk dysglycaemia, respectively. Random glucose performed less well [plasma: 0.76 (95% CI 0.69-0.82) and 0.66 (95% CI 0.62-0.71), respectively; capillary: 0.72 (95% CI 0.65-0.80) and 0.64 (95% CI 0.59-0.68), respectively], and HbA1c performed even less well [0.67 (95% CI 0.57-0.76) and 0.63 (95% CI 0.58-0.68), respectively]. The cost of identifying one case of high-risk dysglycaemia with a plasma glucose challenge test would be $42 from a Veterans Health Administration perspective, and $55 from a US Medicare perspective. CONCLUSIONS Glucose challenge test screening, followed, if abnormal, by an oral glucose tolerance test, would be convenient and more accurate than other opportunistic tests. Use of glucose challenge test screening could improve management by permitting earlier therapy.
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Affiliation(s)
- S L Jackson
- Atlanta VA Medical Center, Decatur, GA, USA
- Nutrition and Health Sciences, Graduate Division of Biological and Biomedical Sciences, Emory University, Atlanta, GA, USA
| | - S E Safo
- Atlanta VA Medical Center, Decatur, GA, USA
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - L R Staimez
- Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - D E Olson
- Atlanta VA Medical Center, Decatur, GA, USA
- Division of Endocrinology and Metabolism, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - K M V Narayan
- Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - Q Long
- Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - J Lipscomb
- Department of Health Policy and Management, Rollins School of Public Health, Emory University, Atlanta, GA, USA
| | - M K Rhee
- Atlanta VA Medical Center, Decatur, GA, USA
- Division of Endocrinology and Metabolism, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | | | - A M Tomolo
- Atlanta VA Medical Center, Decatur, GA, USA
- Division of General Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - L S Phillips
- Atlanta VA Medical Center, Decatur, GA, USA
- Division of Endocrinology and Metabolism, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA
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Zhang QX, Yao YQ, Li SL, Long Q. [Association between interleukin-18 gene polymorphisms and hepatocellular carcinoma caused by hepatitis B virus]. Zhonghua Gan Zang Bing Za Zhi 2017; 24:352-7. [PMID: 27470888 DOI: 10.3760/cma.j.issn.1007-3418.2016.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE To investigate the association between the single nucleotide polymorphisms (SNPs) IL-18-137G/C (rs187238) and IL-18-607A/C (rs1946518) in interleukin-18 (IL-18) gene and hepatocellular carcinoma (HCC) caused by the hepatitis B virus (HBV). METHODS The subjects were divided into HBV-related HCC group (109 patients), chronic HBV infection group (113 patients), and healthy control group (127 patients). The polymerase chain reaction-ligase detection reaction (PCR-LDR) was used to determine the alleles and genotypes of the two SNPs IL-18-137G/C and IL-18-607A/C. The t-test and chi-square test were used for baseline data. The chi-square test was used to investigate the differences in genotype and allele frequencies across the three groups. Non-conditional logistic regression analysis was used to compare the odds ratios (ORs) and 95% confidence intervals (CIs) for different genotypes/alleles in predicting the risk of HBV-related HCC. RESULTS The HBV-related HCC group showed significantly higher AA genotype and A allele frequencies of the SNP IL-18-607A/C than the healthy control group (AA genotype frequency: 29.4% vs 18.1%, χ (2) = 4.152, P < 0.05; A allele frequency: 54.6% vs 44.1%, 5.169, P < 0.05), which were positively correlated with the risk of HBV-related HCC (AA genotype frequency: OR = 1.879, 95% CI: 1.020-3.464; A allele frequency: OR = 1.524, 95% CI: 1.059-2.193). The chronic HBV infection group had a significantly higher A allele frequency of the SNP IL-18-607A/C than the healthy control group (54.0% vs 44.1%, χ (2) = 4.680, P < 0.05), which was positively correlated with the risk of chronic HBV infection (OR = 1.487, 95% CI: 1.037-2.132). The genotype and allele frequencies of the SNP IL-18-607A/C showed no significant differences between the HBV-related HCC group and the chronic HBV infection group (P > 0.05). The genotype and allele frequencies of the SNP IL-18-137G/C showed no significant differences between any two groups of the three groups (P > 0.05). CONCLUSION The AA genotype and A allele frequencies of the SNP IL-18-607A/C are positively correlated with the morbidity of HBV-related HCC, and the A allele frequency of the SNP IL-18-607A/C is positively correlated with the morbidity of chronic HBV infection.
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Affiliation(s)
- Q X Zhang
- Department of Infectious Diseases, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
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25
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Gao TT, Li Y, Liu J, Long Q. [ In vivo confocal microscopic observation of corneal changes in patients with chronic Stevens-Johnson syndrome or toxic epidermal necrolysis]. Zhonghua Yan Ke Za Zhi 2017; 53:177-181. [PMID: 28316191 DOI: 10.3760/cma.j.issn.0412-4081.2017.03.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Objective: To describe corneal alterations visible on in vivo confocal microscopy in patients with debilitating ocular sequelae caused by Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN). Methods: Twenty-two eyes of 11 consecutive patients suffering from chronic SJS or TEN were studied using slit lamp and in vivo confocal microscopy in the Ophthalmology Outpatient Department of Peking Union Medical College Hospital from March 2014 to April 2015. Results: Dry eye with meibomian gland dysfunction (19 eyes of 10 patients, 86.4%) was the most frequent clinical sequelae. Two patients (3 eyes, 13.6%) had severe vison loss with corneal neovascularization and conjunctivization. One patient had asymmetric binocular disease. Corneal epithelial cells were observed at an active state in 10 patients (19 eyes, 86.4%) and corneal stromal cells at an active state in all patients (22 eyes, 100%). Twenty eyes (10 patients, 91%) were noted with abnormal nerve layout and 10 eyes (5 patients, 45.5%) with dendritic cell infiltration around pathological nerve damages. Numerous inflammory cells were observed in 6 eyes (3 patients, 27.3%). Conclusions: The corneas of patients with chronic ocular sequelae associated with SJS or TEN present a number of abnormalities. In vivo confocal microscopy is a potetial useful tool for therapeutic indications and for follow-up of the debilitating chronic ocular problems linked to SJS and TEN. (Chin J Ophthalmol, 2017, 53:177-181).
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Affiliation(s)
- T T Gao
- Department of Ophthalmology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China
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Long Q, Yao YQ, Yan CG. [Research advances in necessity of antiviral therapy for chronic hepatitis B virus carriers]. Zhonghua Gan Zang Bing Za Zhi 2017; 24:465-8. [PMID: 27465955 DOI: 10.3760/cma.j.issn.1007-3418.2016.06.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Chronic hepatitis B virus (HBV) carriers are facing the risk of progression to liver fibrosis, liver cirrhosis, and hepatocellular carcinoma. However, due to low risk, slow disease progression, and unsatisfactory short-term effect of antiviral treatment, controversy still exists over whether such patients should be given antiviral treatment. This article reviews the research advances in the necessity and feasibility of antiviral therapy for chronic hepatitis B virus carriers, so as to provide a reference for clinical practice.
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Affiliation(s)
- Q Long
- Department of Infectious Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
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Abstract
AIM This study aims to investigate the medical expenditure of people with Type 2 diabetes mellitus in Chongqing, China; to explore factors that contribute to the expenditure; and to examine the financial burden placed on households, particularly poor households. METHODS A cross sectional survey was conducted with a sample of people diagnosed with Type 2 diabetes mellitus in 2014. Of the 664 people eligible, 76% were interviewed. Descriptive statistics and log-linear regression were used to examine respondents' age, sex and level education, location of residence, income and type of health insurance associated with out-of-pocket expenditure on accessing diabetes mellitus care. RESULTS In a year, average out-of-pocket expenditure on the purchase of drugs from pharmacies and having outpatient care were US $333 and US $310, respectively. The average out-of-pocket expenditure on accessing inpatient care was 3.7 times (US $1159) that of accessing outpatient care. After adjusting for age and sex, out-of-pocket expenditure on diabetes care was significantly higher for people covered by the Urban Employee Basic Medical Insurance programme and those enrolled in the identified priority diseases reimbursement programme, which provided higher reimbursement rates for outpatient and (or) inpatient care. Out-of-pocket expenditures on the purchase of drugs from pharmacies, having outpatient and inpatient care, respectively, were 9.8%, 16.2% and 62.6% of annual household income in low-income group. CONCLUSION Even with health insurance coverage, poor people with Type 2 diabetes mellitus suffered from significant financial hardship. This has significant implications for models of care and healthcare financing in China with the growing burden of diabetes.
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Affiliation(s)
- Q Long
- Global Health Research Center, Duke Kunshan University, Kunshan, China
- Duke Global Health Institute, Duke University, Durham, NC, USA
| | - M He
- School of Public Health and Management, Chongqing Medical University, Chongqing, China
| | - X Tang
- School of Public Health and Management, Chongqing Medical University, Chongqing, China
| | - P Allotey
- School of Medicine and Health Sciences, Monash University Malaysia, Selangor Darul Ehsan, Malaysia
| | - S Tang
- Global Health Research Center, Duke Kunshan University, Kunshan, China
- Duke Global Health Institute, Duke University, Durham, NC, USA
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Long Q, Oladapo OT, Leathersich S, Vogel JP, Carroli G, Lumbiganon P, Qureshi Z, Gülmezoglu AM. Clinical practice patterns on the use of magnesium sulphate for treatment of pre-eclampsia and eclampsia: a multi-country survey. BJOG 2016; 124:1883-1890. [PMID: 27885772 PMCID: PMC5697690 DOI: 10.1111/1471-0528.14400] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2016] [Indexed: 11/29/2022]
Abstract
Objective To characterise the current clinical practice patterns regarding the use of magnesium sulphate (MgSO4) for eclampsia prevention and treatment in a multi‐country network of health facilities and compare with international recommendations. Design Cross‐sectional survey. Setting A total of 147 health facilities in 15 countries across Africa, Latin America and Asia. Population Heads of obstetric departments or maternity units. Methods Anonymous online and paper‐based survey conducted in 2015. Main outcome measures Availability and use of MgSO4; availability of a formal clinical protocol for MgSO4 administration; and MgSO4 dosing regimens for eclampsia prevention and treatment. Results Magnesium sulphate and a formal protocol for its administration were reported to be always available in 87.4% and 86.4% of all facilities, respectively. MgSO4 was used for the treatment of mild pre‐eclampsia, severe pre‐eclampsia and eclampsia in 24.3%, 93.5% and 96.4% of all facilities, respectively. Regarding the treatment of severe pre‐eclampsia, 26.4% and 7.0% of all facilities reported using dosing regimens that were consistent with Zuspan and Pritchard regimens, respectively. Across regions, intramuscular maintenance regimens were more commonly used in the African region (45.7%) than in the Latin American (3.0%) and Asian (22.9%) regions, whereas intravenous maintenance regimens were more often used in the Latin American (94.0%) and Asian (60.0%) regions than in the African region (21.7%). Similar patterns were found for the treatment of eclampsia across regions. Conclusions The reported clinical use of MgSO4 for eclampsia prevention and treatment varied widely, and was largely inconsistent with current international recommendations. Tweetable abstract MgSO4 regimens for eclampsia prevention and treatment in many hospitals are inconsistent with international recommendations. MgSO4 regimens for eclampsia prevention and treatment in many hospitals are inconsistent with international recommendations.
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Affiliation(s)
- Q Long
- UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - O T Oladapo
- UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - S Leathersich
- King Edward Memorial Hospital for Women, Perth, WA, Australia
| | - J P Vogel
- UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - G Carroli
- Centro Rosarino de Estudios Perinatales, Rosario, Argentina
| | - P Lumbiganon
- Department of Obstetrics and Gynaecology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Z Qureshi
- Department of Obstetrics and Gynaecology, School of Medicine, College of Health Sciences, University of Nairobi, Nairobi, Kenya
| | - A M Gülmezoglu
- UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland
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Wang Y, Tao Z, Zheng H, Zhang F, Long Q, Deng Z, Tao M. Iteratively improving natamycin production in Streptomyces gilvosporeus by a large operon-reporter based strategy. Metab Eng 2016; 38:418-426. [PMID: 27746324 DOI: 10.1016/j.ymben.2016.10.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 08/09/2016] [Accepted: 10/12/2016] [Indexed: 10/20/2022]
Abstract
Many high-value secondary metabolites are assembled by very large multifunctional polyketide synthases or non-ribosomal peptide synthetases encoded by giant genes, for instance, natamycin production in an industrial strain of Streptomyces gilvosporeus. In this study, a large operon reporter-based selection system has been developed using the selectable marker gene neo to report the expression both of the large polyketide synthase genes and of the entire gene cluster, thereby facilitating the selection of natamycin-overproducing mutants by iterative random mutagenesis breeding. In three successive rounds of mutagenesis and selection, the natamycin titer was increased by 110%, 230%, and 340%, respectively, and the expression of the whole biosynthetic gene cluster was correspondingly increased. An additional copy of the natamycin gene cluster was found in one overproducer. These findings support the large operon reporter-based selection system as a useful tool for the improvement of industrial strains utilized in the production of polyketides and non-ribosomal peptides.
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Affiliation(s)
- Yemin Wang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Zhengsheng Tao
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Hualiang Zheng
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Fei Zhang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Qingshan Long
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Zixin Deng
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Meifeng Tao
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200030, China.
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Gao TT, Long Q. [Recent progress in research of pathogeneses of Stevens-Johnson syndrome and toxic epidermal necrolysis]. Zhonghua Yan Ke Za Zhi 2016; 52:708-13. [PMID: 27647252 DOI: 10.3760/cma.j.issn.0412-4081.2016.09.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Stevens-Johnson syndrome(SJS)and toxic epidermal necrolysis(TEN)are life-threatening cutaneous adverse drug reactions that induce widespread epidermal necrosis. Ocular and cutaneous diseases are common chronic sequelae of SJS and TEN. Several concepts have been proposed to explain the pathogenesis of severe cutaneous adverse drug reactions. Recent advances in genetic, pharmacogenomics and immunologic studies have provided evidences of genetic predispositions, drug metabolism and cytokines related to SJS and TEN. With regard to keratinocyte death, several cell death mediators, such as Fas/FasL, granulysin and TNF, have been proposed to play an important role in the pathogeneses of SJS and TEN. A subset of T lymphocytes, including regulatory T cells, may also play a role. This review summarizes the pathogeneses of SJS and TEN mainly from the aspects of genetic susceptibilities, drug metabolism, and immune cells and cytokines. (Chin J Ophthalmol, 2016, 52: 708-713).
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Affiliation(s)
- T T Gao
- Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China
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Liu X, Long Q, Guo S. Perioperative treatment with beta-blocker and andrographolide abrogates surgery-induced acceleration of endometriosis development in mouse. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zhu YQ, Long Q, Wang C, Shuai XJ, Chen B, Kong J, Wei YL. [Relationship between sleep architecture and blood pressure dynamic change in patients with sleep apnea syndrome]. Zhonghua Yi Xue Za Zhi 2016; 96:2220-3. [PMID: 27480652 DOI: 10.3760/cma.j.issn.0376-2491.2016.28.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE To investigate sleep architecture and blood pressure dynamic change in patients with Sleep apnea syndrome by electrocardiogram-based cardiopulmonary coupling analysis system. METHODS Seventy-nine sleep disorder participants (PSQI≥8) were enrolled. Electrocardiogram-based cardiopulmonary coupling analysis device and ambulatory blood pressure monitoring were synchronously used to evaluate sleep architecture and blood pressure circadian rhythm. The patients were divided into SAS group (47 participants) and non-SAS group (32 participants) according to the Apnea Hypopnea Index (AHI) that calculated by CPC device. The data of sleep architecture and blood pressure variability were compared between two groups. RESULTS Compared with non-SAS group, SAS group have less proportion of deep sleep, more proportion of light sleep, higher mean blood pressure in 24 hours and daytime, lower nocturnal blood pressure dipping, faster mean heart rate in night time (P<0.05). AHI has moderate inverse correlation with deep sleep time, wake/dream time (-0.6≤r<-0.3), moderate positive correlation with light sleep time (0.3<r≤0.6), high inverse correlation with nocturnal blood pressure dipping (r=-0.785, P=0.000), moderate positive correlation with mean diastolic blood pressure (r=0.425, P=0.019). CONCLUSION Our study shows that less proportion of deep sleep, more proportion of light sleep, 24 hours mean blood pressure and nocturnal blood pressure increase in the patients with Sleep Apnea Syndrome. The severity of Sleep Apnea Syndrome has a positive correlation with the severity of abnormal sleep architecture and the degree of blood pressure elevation.
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Affiliation(s)
- Y Q Zhu
- Internation Medical Center, China-Japan Friendship Hospital, Beijing 100029, China
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Liu S, Meng G, Zheng LL, Li CL, Xie WW, Long Q. [Analysis on the total allergens of phoenix roebelenii pollen with two dimensional electrophoresis followed by immunoblotting]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:878-880. [PMID: 29797933 DOI: 10.13201/j.issn.1001-1781.2016.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Indexed: 11/12/2022]
Abstract
Objective:To investigate allergen extract and to seek the main allergens of phoenix roebelenii pollen by the technology of two dimensional electrophoresis(2-DE)in protein analysis and immunoblotting.Method:Phoenix roebelenii pollen allergen extract was prepared with routine method, 2-DE combined with immunoblotting assay(Western Blotting),laser imagescanning, 2-DE gel analysis software were used to analyzing its protein components.Result:About 601 soluble proteins spots were revealed in coomassie stained gels.Most of the proteins had a molecular weight (Mr) of 20 to 130 kD, and an isoelectric point(pI) value of 4.0 to 8.0. Immunoblotting of 2-DE were showed and there were 19 specific antigen spots, compared with the controls.Conclusion:2-DE is a good method in protein analysis of ephemeroptera allergen extract, and it is useful in seeking main allergens and further research for allergic components.
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Affiliation(s)
- S Liu
- Department of Otolaryngology Head and Neck Surgery, Haikou People's Hospital, Haikou, 570208, China
| | - G Meng
- Department of Otolaryngology Head and Neck Surgery, Haikou People's Hospital, Haikou, 570208, China
| | - L L Zheng
- Central Laboratory of Haikou People's Hospital
| | - C L Li
- Department of Otolaryngology Head and Neck Surgery, Haikou People's Hospital, Haikou, 570208, China
| | - W W Xie
- Department of Otolaryngology Head and Neck Surgery, Haikou People's Hospital, Haikou, 570208, China
| | - Q Long
- Department of Otolaryngology Head and Neck Surgery, Haikou People's Hospital, Haikou, 570208, China
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Xie L, Yu H, Deng Y, Yang W, Liao L, Long Q. Preparation andin vitrodegradation study of the porous dual alpha/beta-tricalcium phosphate bioceramics. ACTA ACUST UNITED AC 2016. [DOI: 10.1179/1433075x15y.0000000079] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- L. Xie
- State Key Laboratory of Oral Diseases, West China College of stomatology, Sichuan University, Chengdu 610065, China
| | - H. Yu
- State Key Laboratory of Oral Diseases, West China College of stomatology, Sichuan University, Chengdu 610065, China
| | - Y. Deng
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
- Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - W. Yang
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - L. Liao
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Q. Long
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
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Long Q, Hei Y, Luo Q, Tian Y, Yang J, Li J, Wei L, Liu W. BMSCs transplantation improves cognitive impairment via up-regulation of hippocampal GABAergic system in a rat model of chronic cerebral hypoperfusion. Neuroscience 2015; 311:464-73. [DOI: 10.1016/j.neuroscience.2015.10.055] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2015] [Revised: 10/26/2015] [Accepted: 10/29/2015] [Indexed: 02/06/2023]
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Lei P, Xu L, Nwaru BI, Long Q, Wu Z. Social networks and health-related quality of life among Chinese old adults in urban areas: results from 4th National Household Health Survey. Public Health 2015; 131:27-39. [PMID: 26631913 DOI: 10.1016/j.puhe.2015.10.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 03/10/2015] [Accepted: 10/22/2015] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To examine the associations between components of social networks and health-related quality of life (HRQoL) in community-dwelling old adults in urban areas in China. STUDY DESIGN Data from the 4th National Household Health Survey (NHHS) in China, conducted in 2008, were used. HRQoL of respondents aged ≥15 years was assessed using EQ-5D in the NHHS. METHODS The sample for the current analysis included 9833 old adults aged ≥60 years. Multiple linear and logistic regression models were used to assess the associations between indicators of social network and HRQoL. RESULTS Approximately 6% of the respondents saw their children once a year or less, and approximately 1% reported that they had no children. Thirteen percent of the sample seldom contacted their neighbours and seldom met with relatives or friends; approximately 62% seldom attended social gatherings. The five dimensions of HRQoL (mobility, self-care, usual activities, pain/discomfort and anxiety/depression) were reported to be moderate or severe in 14.5%, 9.4%, 12.6%, 18.3% and 9.3% of the sample, respectively. The mean visual analogue scale (VAS) score and EQ-5D index using the time trade-off method was 70.96 [standard deviation (SD) 14.79] and 0.869 (SD 0.163), respectively. After adjusting for potential confounding variables, old adults with weaker social networks were more likely to report problems on EQ-5D dimensions, lower VAS scores and lower EQ-5D indexes. CONCLUSIONS For old adults living in urban communities in China, increased social participation has a positive effect on various dimensions of HRQoL. There is a need for policy considerations that will improve integration of community-level public resources in order to encourage frequent social interaction among old adults, and promote health and social care as a whole.
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Affiliation(s)
- P Lei
- Department of Social Medicine, School of Public Health, Fudan University, Shanghai, China; Medical Insurance Office, Bureau of Human Resources and Social Security, People's Government of Xuhui District, Shanghai, China
| | - L Xu
- Centre for Health Statistics and Information, National Health and Family Planning Commission of China, Beijing, China
| | - B I Nwaru
- Centre for Population Health Sciences, University of Edinburgh, Edinburgh, UK; School of Health Sciences, University of Tampere, Tampere, Finland
| | - Q Long
- Global Health Research Centre, Duke Kunshan University, Kunshan, China
| | - Z Wu
- Department of Social Medicine, School of Public Health, Fudan University, Shanghai, China; Key Laboratory of Public Health Safety, Ministry of Education (Fudan University), Shanghai, China.
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Okusanya BO, Oladapo OT, Long Q, Lumbiganon P, Carroli G, Qureshi Z, Duley L, Souza JP, Gülmezoglu AM. Clinical pharmacokinetic properties of magnesium sulphate in women with pre-eclampsia and eclampsia. BJOG 2015; 123:356-66. [PMID: 26599617 PMCID: PMC4737322 DOI: 10.1111/1471-0528.13753] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/22/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND The pharmacokinetic basis of magnesium sulphate (MgSO4 ) dosing regimens for eclampsia prophylaxis and treatment is not clearly established. OBJECTIVES To review available data on clinical pharmacokinetic properties of MgSO4 when used for women with pre-eclampsia and/or eclampsia. SEARCH STRATEGY MEDLINE, EMBASE, CINAHL, POPLINE, Global Health Library and reference lists of eligible studies. SELECTION CRITERIA All study types investigating pharmacokinetic properties of MgSO4 in women with pre-eclampsia and/or eclampsia. DATA COLLECTION AND ANALYSIS Two authors extracted data on basic pharmacokinetic parameters reflecting the different aspects of absorption, bioavailability, distribution and excretion of MgSO4 according to identified dosing regimens. MAIN RESULTS Twenty-eight studies investigating pharmacokinetic properties of 17 MgSO4 regimens met our inclusion criteria. Most women (91.5%) in the studies had pre-eclampsia. Baseline serum magnesium concentrations were consistently <1 mmol/l across studies. Intravenous loading dose between 4 and 6 g was associated with a doubling of this baseline concentration half an hour after injection. Maintenance infusion of 1 g/hour consistently produced concentrations well below 2 mmol/l, whereas maintenance infusion at 2 g/hour and the Pritchard intramuscular regimen had higher but inconsistent probability of producing concentrations between 2 and 3 mmol/l. Volume of distribution of magnesium varied (13.65-49.00 l) but the plasma clearance was fairly similar (4.28-5.00 l/hour) across populations. CONCLUSION The profiles of Zuspan and Pritchard regimens indicate that the minimum effective serum magnesium concentration for eclampsia prophylaxis is lower than the generally accepted level. Exposure-response studies to identify effective alternative dosing regimens should target concentrations achievable by these standard regimens. TWEETABLE ABSTRACT Minimum effective serum magnesium concentration for eclampsia prophylaxis is lower than the generally accepted therapeutic level.
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Affiliation(s)
- B O Okusanya
- Experimental and Maternal Medicine (EMM) Unit, Department of Obstetrics and Gynaecology, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria
| | - O T Oladapo
- UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - Q Long
- UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland
| | - P Lumbiganon
- Department of Obstetrics and Gynaecology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - G Carroli
- Centro Rosarino de Estudios Perinatales, Rosario, Argentina
| | - Z Qureshi
- Department of Obstetrics and Gynaecology, School of Medicine, College of Health Sciences, University of Nairobi, Nairobi, Kenya
| | - L Duley
- Nottingham Clinical Trials Unit, Queens Medical Centre, Nottingham, UK
| | - J P Souza
- Department of Social Medicine, Ribeirao Preto School of Medicine, University of Sao Paulo, Ribeirao Preto, São Paulo, Brazil
| | - A M Gülmezoglu
- UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland
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Huang C, Long Q, Qian K, Fu T, Zhang Z, Liao P, Xie J. Resistance and integron characterization of Acinetobacter baumannii in a teaching hospital in Chongqing, China. New Microbes New Infect 2015; 8:103-8. [PMID: 26649184 PMCID: PMC4644259 DOI: 10.1016/j.nmni.2015.09.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Revised: 09/23/2015] [Accepted: 09/24/2015] [Indexed: 10/25/2022] Open
Abstract
A total of 189 Acinetobacter baumannii isolates were collected in 2011 from a teaching hospital in Chongqing, China. Susceptibility data showed strains carrying integrons were significantly more resistant to all tested antibiotics that strains lacking integrons. Five types of gene cassettes belonging to class I integrons were identified in this study, and for the first time two types of gene cassettes belonging to class II integrons are reported. Most of the cassettes belong to a class I integron (136/144) encoding arr3, aacA4, dfrA17, aadA5, aadB, cat, blaOXA10 , aadA1, aadA2, dfrA and aacC1. Isolates contained a class I gene cassette; AadA2-HP-dfrA was the prevalent strain in this hospital. A class II integron was detected in eight strains, which contained the type IV fimbriae expression regulatory gene pilR and sulfate adenylyltransferase, suggesting a possible role in multidrug resistance. The major epidemic strains from intensive care unit patients belong to international clone 2. In conclusion, the presence of integrons was significantly associated with multiple drug resistance of A. baumannii in this hospital, and class I integron isolates bearing AadA2-HP-dfrA were the prevalent strain in this hospital.
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Affiliation(s)
- C Huang
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Beibei, China ; The Fifth People's Hospital of Chongqing, Nanan, China
| | - Q Long
- The Key Laboratory of Molecular Biology of Infectious Diseases of the Chinese Ministry of Education, Chongqing Medical University, Yuzhong, Chongqing, China ; Chongqing Center for Clinical Laboratory, The Third People's Hospital of Chongqing, Yuzhong, Chongqing, China
| | - K Qian
- The Fifth People's Hospital of Chongqing, Nanan, China
| | - T Fu
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Beibei, China
| | - Z Zhang
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Beibei, China ; Chongqing Center for Clinical Laboratory, The Third People's Hospital of Chongqing, Yuzhong, Chongqing, China
| | - P Liao
- Chongqing Center for Clinical Laboratory, The Third People's Hospital of Chongqing, Yuzhong, Chongqing, China
| | - J Xie
- Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Beibei, China
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Dubowitz N, Xue W, Long Q, Ownby JG, Olson DE, Barb D, Rhee MK, Mohan AV, Watson-Williams PI, Jackson SL, Tomolo AM, Johnson TM, Phillips LS. Aging is associated with increased HbA1c levels, independently of glucose levels and insulin resistance, and also with decreased HbA1c diagnostic specificity. Diabet Med 2014; 31:927-35. [PMID: 24698119 DOI: 10.1111/dme.12459] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 01/06/2014] [Accepted: 03/28/2014] [Indexed: 01/05/2023]
Abstract
AIM To determine whether using HbA1c for screening and management could be confounded by age differences, whether age effects can be explained by unrecognized diabetes and prediabetes, insulin resistance or postprandial hyperglycaemia, and whether the effects of aging have an impact on diagnostic accuracy. METHODS We conducted a cross-sectional analysis in adults without known diabetes in the Screening for Impaired Glucose Tolerance (SIGT) study 2005-2008 (n=1573) and the National Health and Nutrition Examination Survey (NHANES) 2005-2006 (n=1184). RESULTS Both glucose intolerance and HbA(1c) levels increased with age. In univariate analyses including all subjects, HbA(1c) levels increased by 0.93 mmol/mol (0.085%) per 10 years of age in the SIGT study and by 1.03 mmol/mol (0.094%) per 10 years in the NHANES; in both datasets, the HbA(1c) increase was 0.87 mmol/mol (0.08%) per 10 years in subjects without diabetes, and 0.76 mmol/mol (0.07%) per 10 years in subjects with normal glucose tolerance, all P<0.001. In multivariate analyses of subjects with normal glucose tolerance, the relationship between age and HbA(1c) remained significant (P<0.001) after adjustment for covariates including race, BMI, waist circumference, sagittal abdominal diameter, triglyceride/HDL ratio, and fasting and 2-h plasma glucose and other glucose levels, as assessed by an oral glucose tolerance test. In both datasets, the HbA(1c) of an 80-year-old individual with normal glucose tolerance would be 3.82 mmol/mol (0.35%) greater than that of a 30-year-old with normal glucose tolerance, a difference that is clinically significant. Moreover, the specificity of HbA(1c) -based diagnostic criteria for prediabetes decreased substantially with increasing age (P<0.0001). CONCLUSIONS In two large datasets, using different methods to measure HbA(1c), the association of age with higher HbA(1c) levels: was consistent and similar; was both statistically and clinically significant; was unexplained by features of aging; and reduced diagnostic specificity. Age should be taken into consideration when using HbA(1c) for the diagnosis and management of diabetes and prediabetes.
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Affiliation(s)
- N Dubowitz
- Atlanta VA Medical Center, Decatur, GA, USA; Division of Geriatrics, Emory University School of Medicine, Atlanta, GA, USA
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Gao H, Long Q, Sadat U, Graves M, Gillard JH, Li ZY. Stress analysis of carotid atheroma in a transient ischaemic attack patient using the MRI-based fluid-structure interaction method. Br J Radiol 2010; 82 Spec No 1:S46-54. [PMID: 20348536 DOI: 10.1259/bjr/20307071] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Rupture of atherosclerotic plaque is a major cause of mortality. Plaque stress analysis, based on patient-specific multisequence in vivo MRI, can provide critical information for the understanding of plaque rupture and could eventually lead to plaque rupture prediction. However, the direct link between stress and plaque rupture is not fully understood. In the present study, the plaque from a patient who recently experienced a transient ischaemic attack (TIA) was studied using a fluid-structure interaction method to quantify stress distribution in the plaque region based on in vivo MR images. The results showed that wall shear stress is generally low in the artery with a slight increase at the plaque throat owing to minor luminal narrowing. The oscillatory shear index is much higher in the proximal part of the plaque. Both local wall stress concentrations and the relative stress variation distribution during a cardiac cycle indicate that the actual plaque rupture site is collocated with the highest rupture risk region in the studied patient.
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Affiliation(s)
- H Gao
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, UK
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Long Q, Zhou P, Xie J. O64 Riboflavin biosynthesis pathways as potential drug targets revealed by comparative genomic analysis. Int J Antimicrob Agents 2009. [DOI: 10.1016/s0924-8579(09)70211-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Long Q, Merrifield R, Xu XY, Kilner P, Firmin DN, Yang GZ. Subject-specific computational simulation of left ventricular flow based on magnetic resonance imaging. Proc Inst Mech Eng H 2008; 222:475-85. [DOI: 10.1243/09544119jeim310] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A detailed investigation of left ventricle (LV) flow patterns could improve our understanding of the function of the heart and provide further insight into the mechanisms of heart failure. This study presents patient-specific modelling with magnetic resonance imaging (MRI) to investigate LV blood flow patterns in normal subjects. In the study, the prescribed LV wall movements based on the MRI measurements drove the blood flow in and out of the LV in computational fluid dynamics simulation. For the six subjects studied, the simulated LV flow swirls towards the aortic valve and is ejected into the ascending aorta with a vertical flow pattern that follows the left-hand rule. In diastole, the inflow adopts a reasonably straight route (with no significant secondary flow) towards the apex in the rapid filling phase with slight variations in the jet direction between different cases. When the jet reaches about two thirds of the distance from the inflow plane to the apex, the blood flow starts to change direction and swirls towards the apex. In the more slowly filling phase, a centrally located jet is evident with vortices located on both sides of the jet on an anterior—posterior plane that passes through the mitral and aortic valves. In the inferior—superior plane, a main vortex appears for most of the cases in which an anticlockwise vortex appears for three cases and a clockwise vortex occurs for one case. The simulated flow patterns agree well qualitatively with MRI-measured flow fields.
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Affiliation(s)
- Q Long
- Brunel Institute for Bioengineering, Brunel University, Uxbridge, UK
| | - R Merrifield
- Institute of Biomedical Engineering, Imperial College London, London, UK
| | - X Y Xu
- Department of Chemical Engineering and Chemical Technology, Imperial College London, London, UK
| | - P Kilner
- Cardiovascular MR Unit, Royal Brompton Hospital, Imperial College London, London, UK
| | - D N Firmin
- Cardiovascular MR Unit, Royal Brompton Hospital, Imperial College London, London, UK
| | - G-Z Yang
- Institute of Biomedical Engineering, Imperial College London, London, UK
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Feng J, Long Q, Khir AW. Wave dissipation in flexible tubes in the time domain: In vitro model of arterial waves. J Biomech 2007; 40:2130-8. [PMID: 17166499 DOI: 10.1016/j.jbiomech.2006.10.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2006] [Accepted: 10/30/2006] [Indexed: 01/09/2023]
Abstract
Earlier work of wave dissipation in flexible tubes and arteries has been carried out predominantly in the frequency domain and most of the studies used the measured pressure waveform for presenting the results. In this work we investigate the pattern of wave dissipation in the time domain using the separated forward and backward travelling waves in flexible tubes. We tested four sizes of latex tubes of 2m in length each, where a single semi-sinusoidal in shape, pressure wave, was produced at the inlet of each tube. Simultaneous measurements of pressure and flow waveforms were recorded every 5cm along the tubes and wave speed was determined using the pressure-velocity loop method (PU-loop). The measured data and wave speed were used to separate the pressure waveform and wave intensity, into their forward and backward directions, using wave intensity analysis (WIA). Also, the energy carried by the wave was calculated by integrating the relevant area under the wave intensity curve. The peak of the measured pressure waveform increased downstream, however, the peak of the separated forward pressure waveform decreased exponentially along the tube. Wave intensity and energy also dissipated exponentially along the travelling distance. The peaks of the separated pressure and wave intensity decreased in the forward in a similar exponential way to that in the backward direction in all four tube sizes. Also, the smaller the size of the tube the greater wave dissipation it caused. We conclude that wave separation is useful in studying wave dissipation in elastic tubes, and WIA provides a convenient method for determining the dissipation of the energy carried by the wave along the travelled distance. The separated pressure waveform, wave intensity and wave energy dissipate exponentially with the travelling distance, and wave dissipation varies conversely with the diameter of elastic tubes.
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Affiliation(s)
- J Feng
- Brunel Institute for Bioengineering and School of Engineering and Design, Brunel University, Uxbridge, Middlesex, UK
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König C, Long Q, Collins M, Xu S. Numerical assessment of wall shear stress along the endothelial surface layer in small arteries. Biomed Pharmacother 2006. [DOI: 10.1016/j.biopha.2006.07.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Long Q, Merrifield R, Yang GZ, Kilner PJ, Firmin DN, Xu XY. The influence of inflow boundary conditions on intra left ventricle flow predictions. J Biomech Eng 2004; 125:922-7. [PMID: 14986421 DOI: 10.1115/1.1635404] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The combination of computational fluid dynamics (CFD) and magnetic resonance imaging (MRI) offers a promising tool that enables the prediction of blood flow patterns in subject-specific cardiovascular models. The influence of the model geometry on the accuracy of the simulation is well recognized. This paper addresses the impact of different boundary conditions on subject-specific simulations of left ventricular (LV) flow. A novel hybrid method for prescribing effective inflow boundary conditions in the mitral valve plane has been developed. The detailed quantitative results highlight the strengths as well as the potential pitfalls of the approach.
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Affiliation(s)
- Q Long
- Faculty of Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
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Zhao SZ, Papathanasopoulou P, Long Q, Marshall I, Xu XY. Comparative study of magnetic resonance imaging and image-based computational fluid dynamics for quantification of pulsatile flow in a carotid bifurcation phantom. Ann Biomed Eng 2003; 31:962-71. [PMID: 12918911 DOI: 10.1114/1.1590664] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A combined magnetic resonance imaging (MRI) and computational fluid dynamics (CFD) modeling study was carried out for pulsatile flow in a carotid bifurcation phantom. The aim of the study was to quantify differences in flow patterns between MRI measurement and MRI-based CFD simulations and to further explore the potential for in vivo applications. The computational model was reconstructed from high resolution magnetic resonance (MR) scans. Velocities derived from phase-contrast MR measurements were used as boundary conditions for the CFD calculation. Detailed comparisons of velocity patterns were made between the CFD results and MRI measurements. Good agreement was achieved for the main velocity component in both well-behaved flow (in the common carotid) and disturbed region (in the carotid sinus). Comparison of in-plane velocity vectors showed less satisfactory consistency and revealed that the MR measurements obtained were inadequate to depict the secondary flow pattern as expected. It can be concluded that the combined MRI/CFD is expected to provide more reliable information about the full three-dimensional velocity field.
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Affiliation(s)
- S Z Zhao
- Department of Chemical Engineering and Chemical Technology, Imperial College, London, United Kingdom.
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Long Q, Ariff B, Zhao SZ, Thom SA, Hughes AD, Xu XY. Reproducibility study of 3D geometrical reconstruction of the human carotid bifurcation from magnetic resonance images. Magn Reson Med 2003; 49:665-74. [PMID: 12652537 DOI: 10.1002/mrm.10401] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The combined magnetic resonance imaging (MRI) and computational fluid dynamics (CFD) modeling approach is playing an increasingly important role in advancing our understanding of the relationship between hemodynamics and arterial disease. Nevertheless, such a modeling approach involves a number of uncertainties associated with various stages of the process. The present study is concerned with the reproducibility of geometry reconstruction, one of the most crucial steps in the modeling process. The reproducibility test was conducted on the right carotid bifurcation of eight normal human subjects, each of whom were scanned twice using the same MR protocol with an in-plane resolution of 0.625 mm. Models constructed from different scans of the same subject were compared and assessed using four quantitative measures: centerline distance, cross-sectional area, contour shape factors, and mean radius difference. The difference in the maximum carotid bulb area between the two scans was found to be <8.1% for all subjects. Shape factors (measuring the dissimilarity between two contours) of <10% were achieved in most of the common carotid arteries (CCAs) and internal carotid arteries (ICAs). The mean radius difference between the two scans was <0.4 mm for all subjects. Among the three vessels, the geometry of CCA was well reproduced by the reconstruction procedure in most of the cases, while the external carotid artery (ECA) showed the worst reproducibility. The impact of geometrical differences on CFD-predicted flow patterns and wall shear stress (WSS) will be investigated and discussed in a separate paper.
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Affiliation(s)
- Q Long
- Department of Chemical Engineering and Chemical Technology, Imperial College, Prince Consort Road, London SW7 2BY, UK.
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Glor FP, Long Q, Hughes AD, Augst AD, Ariff B, Thom SAM, Verdonck PR, Xu XY. Reproducibility study of magnetic resonance image-based computational fluid dynamics prediction of carotid bifurcation flow. Ann Biomed Eng 2003; 31:142-51. [PMID: 12627821 DOI: 10.1114/1.1537694] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The importance of shear stress in the initiation and progression of atherosclerosis has been recognized for some time. A novel way to quantify wall shear stress under physiologically realistic conditions is to combine magnetic resonance imaging (MRI) and computational fluid dynamics. The present study aims to investigate the reproducibility of the simulated flow by using this combined approach. The right carotid bifurcations of eight healthy subjects were scanned twice with MRI within a few weeks. Three-dimensional geometries of the vessels were reconstructed for each scan and each subject. Pulsatile flows through these models were calculated to assess errors associated with the predicted flow parameters. This was done by comparing various wall shear stress indices, including the time-averaged wall shear stress (WSS), oscillating shear index (OSI), WSS Gradients (WSSG) and WSS Angle Deviation (WSSAD). Qualitatively, all the wall shear parameters proved to be highly reproducible. Quantitatively, the reproducibility was over 90% for OSI and WSSAD, but less impressive (60%) for other parameters. Our results indicated that WSS and WSSG values were extremely sensitive to subtle variations in local geometry and mesh design, particularly in regions around the bifurcation apex where WSS values were high and least reproducible.
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Affiliation(s)
- F P Glor
- Department of Chemical Engineering, Imperial College, Prince Consort Road, London SW7 2BY, United Kingdom
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King E, Xu XY, Hughes AD, Long Q, Thom SA, Parker KH. Quantification of the non-planarity of the human carotid bifurcation. Biorheology 2002; 39:419-24. [PMID: 12122261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
The carotid bifurcation has been a region of particular interest due to its predilection for clinically significant atherosclerosis. It has been shown that the vessel geometry is a major determinant of the local haemodynamic properties which are believed to be associated with the location of atherosclerotic lesions. Current knowledge of the geometry of the carotid bifurcation is insufficient and restricted to basic geometric parameters. To provide some means of quantifying the degree of complexity of the 3D shape of the bifurcation, we made an initial attempt by evaluating the non-planarity of an arterial bifurcation based upon the singular value decomposition theorem. In this paper we present our results obtained on the right carotid bifurcations of six normal subjects, each of whom was scanned twice using the 2D time-of-flight MR sequence. The acquired 2D cross sectional images were processed by using our in-house software which comprises 2D segmentation, 3D reconstruction and smoothing. The centroids of each transverse slices were determined and used as input data for the non-planarity analysis. Our results using the singular value decomposition method have demonstrated discernible differences in non-planarity among individuals. Comparisons with the planarity definition proposed by other investigators suggest that the singular value decomposition method offers more information about the linearity and planarity of the bifurcation. However, it is also realised that a single measure of non-planarity can never fully characterise a bifurcation owing to the great variety of geometries.
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Affiliation(s)
- E King
- Department of Physics, Imperial College of Science, Technology & Medicine, London, UK
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